"grandmother rule" meaning in English

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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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          "name": "BDSM",
          "orig": "en:BDSM",
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      "glosses": [
        "A rule at certain events requiring that one's behaviour and appearance be such that it would not shock even one's grandmother."
      ],
      "id": "en-grandmother_rule-en-noun-HYbq-UC1",
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          "BDSM",
          "BDSM"
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        [
          "behaviour",
          "behaviour"
        ],
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          "appearance",
          "appearance"
        ],
        [
          "shock",
          "shock"
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        [
          "grandmother",
          "grandmother"
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      "raw_glosses": [
        "(BDSM) A rule at certain events requiring that one's behaviour and appearance be such that it would not shock even one's grandmother."
      ],
      "topics": [
        "BDSM",
        "lifestyle",
        "sexuality"
      ]
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  "word": "grandmother rule"
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  "lang_code": "en",
  "pos": "noun",
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        "en:BDSM"
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      "glosses": [
        "A rule at certain events requiring that one's behaviour and appearance be such that it would not shock even one's grandmother."
      ],
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        [
          "BDSM",
          "BDSM"
        ],
        [
          "behaviour",
          "behaviour"
        ],
        [
          "appearance",
          "appearance"
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          "shock",
          "shock"
        ],
        [
          "grandmother",
          "grandmother"
        ]
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        "(BDSM) A rule at certain events requiring that one's behaviour and appearance be such that it would not shock even one's grandmother."
      ],
      "topics": [
        "BDSM",
        "lifestyle",
        "sexuality"
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  "word": "grandmother rule"
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